/* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; version 2 of the License.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

/**
  @file storage/perfschema/table_prepared_stmt_instances.cc
  Table PREPARED_STATEMENTS_INSTANCES (implementation).
*/

#include "my_global.h"
#include "my_thread.h"
#include "pfs_instr_class.h"
#include "pfs_column_types.h"
#include "pfs_column_values.h"
#include "pfs_global.h"
#include "pfs_instr.h"
#include "pfs_timer.h"
#include "pfs_visitor.h"
#include "pfs_prepared_stmt.h"
#include "table_prepared_stmt_instances.h"
#include "pfs_buffer_container.h"
#include "field.h"

THR_LOCK table_prepared_stmt_instances::m_table_lock;

static const TABLE_FIELD_TYPE field_types[]=
{
  {
    { C_STRING_WITH_LEN("OBJECT_INSTANCE_BEGIN") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("STATEMENT_ID") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("STATEMENT_NAME") },
    { C_STRING_WITH_LEN("varchar(64)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SQL_TEXT") },
    { C_STRING_WITH_LEN("longtext") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("OWNER_THREAD_ID") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("OWNER_EVENT_ID") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("OWNER_OBJECT_TYPE") },
    { C_STRING_WITH_LEN("enum(\'EVENT\',\'FUNCTION\',\'PROCEDURE\',\'TABLE\',\'TRIGGER\')") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("OWNER_OBJECT_SCHEMA") },
    { C_STRING_WITH_LEN("varchar(64)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("OWNER_OBJECT_NAME") },
    { C_STRING_WITH_LEN("varchar(64)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("TIMER_PREPARE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("COUNT_REPREPARE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("COUNT_EXECUTE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_TIMER_EXECUTE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("MIN_TIMER_EXECUTE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("AVG_TIMER_EXECUTE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("MAX_TIMER_EXECUTE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_LOCK_TIME") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_ERRORS") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_WARNINGS") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_ROWS_AFFECTED") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_ROWS_SENT") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_ROWS_EXAMINED") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_CREATED_TMP_DISK_TABLES") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_CREATED_TMP_TABLES") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SELECT_FULL_JOIN") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SELECT_FULL_RANGE_JOIN") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SELECT_RANGE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SELECT_RANGE_CHECK") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SELECT_SCAN") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SORT_MERGE_PASSES") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SORT_RANGE") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SORT_ROWS") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_SORT_SCAN") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_NO_INDEX_USED") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
  {
    { C_STRING_WITH_LEN("SUM_NO_GOOD_INDEX_USED") },
    { C_STRING_WITH_LEN("bigint(20)") },
    { NULL, 0}
  },
};

TABLE_FIELD_DEF
table_prepared_stmt_instances::m_field_def=
{ 35, field_types };

PFS_engine_table_share
table_prepared_stmt_instances::m_share=
{
  { C_STRING_WITH_LEN("prepared_statements_instances") },
  &pfs_truncatable_acl,
  table_prepared_stmt_instances::create,
  NULL, /* write_row */
  table_prepared_stmt_instances::delete_all_rows,
  table_prepared_stmt_instances::get_row_count,
  sizeof(PFS_simple_index),
  &m_table_lock,
  &m_field_def,
  false, /* checked */
  false  /* perpetual */
};

PFS_engine_table*
table_prepared_stmt_instances::create(void)
{
  return new table_prepared_stmt_instances();
}

int
table_prepared_stmt_instances::delete_all_rows(void)
{
  reset_prepared_stmt_instances();
  return 0;
}

ha_rows
table_prepared_stmt_instances::get_row_count(void)
{
  return global_prepared_stmt_container.get_row_count();
}

table_prepared_stmt_instances::table_prepared_stmt_instances()
  : PFS_engine_table(&m_share, &m_pos),
    m_row_exists(false), m_pos(0), m_next_pos(0)
{}

void table_prepared_stmt_instances::reset_position(void)
{
  m_pos= 0;
  m_next_pos= 0;
}

int table_prepared_stmt_instances::rnd_next(void)
{
  PFS_prepared_stmt* pfs;

  m_pos.set_at(&m_next_pos);
  PFS_prepared_stmt_iterator it= global_prepared_stmt_container.iterate(m_pos.m_index);
  pfs= it.scan_next(& m_pos.m_index);
  if (pfs != NULL)
  {
    make_row(pfs);
    m_next_pos.set_after(&m_pos);
    return 0;
  }

  return HA_ERR_END_OF_FILE;
}

int
table_prepared_stmt_instances::rnd_pos(const void *pos)
{
  PFS_prepared_stmt* pfs;

  set_position(pos);

  pfs= global_prepared_stmt_container.get(m_pos.m_index);
  if (pfs != NULL)
  {
    make_row(pfs);
    return 0;
  }

  return HA_ERR_RECORD_DELETED;
}


void table_prepared_stmt_instances::make_row(PFS_prepared_stmt* prepared_stmt)
{
  pfs_optimistic_state lock;
  m_row_exists= false;

  prepared_stmt->m_lock.begin_optimistic_lock(&lock);

  m_row.m_identity= prepared_stmt->m_identity;

  m_row.m_stmt_id= prepared_stmt->m_stmt_id;

  m_row.m_owner_thread_id= prepared_stmt->m_owner_thread_id;
  m_row.m_owner_event_id= prepared_stmt->m_owner_event_id;

  m_row.m_stmt_name_length= prepared_stmt->m_stmt_name_length;
  if(m_row.m_stmt_name_length > 0)
    memcpy(m_row.m_stmt_name, prepared_stmt->m_stmt_name,
           m_row.m_stmt_name_length);

  m_row.m_sql_text_length= prepared_stmt->m_sqltext_length;
  if(m_row.m_sql_text_length > 0)
    memcpy(m_row.m_sql_text, prepared_stmt->m_sqltext,
           m_row.m_sql_text_length);

  m_row.m_owner_object_type= prepared_stmt->m_owner_object_type;

  m_row.m_owner_object_name_length= prepared_stmt->m_owner_object_name_length;
  if(m_row.m_owner_object_name_length > 0)
    memcpy(m_row.m_owner_object_name, prepared_stmt->m_owner_object_name,
           m_row.m_owner_object_name_length);

  m_row.m_owner_object_schema_length= prepared_stmt->m_owner_object_schema_length;
  if(m_row.m_owner_object_schema_length > 0)
    memcpy(m_row.m_owner_object_schema, prepared_stmt->m_owner_object_schema,
           m_row.m_owner_object_schema_length);

  time_normalizer *normalizer= time_normalizer::get(statement_timer);
  /* Get prepared statement prepare stats. */
  m_row.m_prepare_stat.set(normalizer, & prepared_stmt->m_prepare_stat);
  /* Get prepared statement reprepare stats. */
  m_row.m_reprepare_stat.set(normalizer, & prepared_stmt->m_reprepare_stat);
  /* Get prepared statement execute stats. */
  m_row.m_execute_stat.set(normalizer, & prepared_stmt->m_execute_stat);

  if (! prepared_stmt->m_lock.end_optimistic_lock(&lock))
    return;

  m_row_exists= true;
}

int table_prepared_stmt_instances
::read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                  bool read_all)
{
  Field *f;

  if (unlikely(! m_row_exists))
    return HA_ERR_RECORD_DELETED;

  /*
    Set the null bits.
  */
  DBUG_ASSERT(table->s->null_bytes == 1);
  buf[0]= 0;

  for (; (f= *fields) ; fields++)
  {
    if (read_all || bitmap_is_set(table->read_set, f->field_index))
    {
      switch(f->field_index)
      {
      case 0: /* OBJECT_INSTANCE_BEGIN */
        set_field_ulonglong(f, (intptr)m_row.m_identity);
        break;
      case 1: /* STATEMENT_ID */
        set_field_ulonglong(f, m_row.m_stmt_id);
        break;
      case 2: /* STATEMENT_NAME */
        if(m_row.m_stmt_name_length > 0)
          set_field_varchar_utf8(f, m_row.m_stmt_name,
                                 m_row.m_stmt_name_length);
        else
          f->set_null();
        break;
      case 3: /* SQL_TEXT */
        if(m_row.m_sql_text_length > 0)
          set_field_longtext_utf8(f, m_row.m_sql_text,
                                 m_row.m_sql_text_length);
        else
          f->set_null();
        break;
      case 4: /* OWNER_THREAD_ID */
        set_field_ulonglong(f, m_row.m_owner_thread_id);
        break;
      case 5: /* OWNER_EVENT_ID */
        if(m_row.m_owner_event_id > 0)
          set_field_ulonglong(f, m_row.m_owner_event_id);
        else
          f->set_null();
        break;
      case 6: /* OWNER_OBJECT_TYPE */
        if(m_row.m_owner_object_type != 0)
          set_field_enum(f, m_row.m_owner_object_type);
        else
          f->set_null();
        break;
      case 7: /* OWNER_OBJECT_SCHEMA */
        if(m_row.m_owner_object_schema_length > 0)
          set_field_varchar_utf8(f, m_row.m_owner_object_schema,
                                 m_row.m_owner_object_schema_length);
        else
          f->set_null();
        break;
      case 8: /* OWNER_OBJECT_NAME */
        if(m_row.m_owner_object_name_length > 0)
          set_field_varchar_utf8(f, m_row.m_owner_object_name,
                                 m_row.m_owner_object_name_length);
        else
          f->set_null();
        break;
      case 9:    /* TIMER_PREPARE */
        m_row.m_prepare_stat.set_field(1, f);
        break;
      case 10:   /* COUNT_REPREPARE */
        m_row.m_reprepare_stat.set_field(0, f);
        break;
      default: /* 14, ... COUNT/SUM/MIN/AVG/MAX */
        m_row.m_execute_stat.set_field(f->field_index - 11, f);
        break;
      }
    }
  }

  return 0;
}